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SET(VCPKG_POLICY_EMPTY_PACKAGE enabled)
# Due to the interaction between BLAS and LAPACK, we need to choose implementations consistent with
# each other.
#
# First, if we are on Apple, we use the Accelerate framework.
#
# Then, we prefer to use openblas and lapack-reference for blas and lapack, respectively, but
# sometimes are unable.
#
# If we are on Windows and arm or uwp, that we use gfortran as our fortran compiler creates an issue
# because there is no available libgfortran. This means we can't use lapack-reference at all.
#
# If we are on Windows and static, there is a linking problem caused by static gfortran in the same
# link as openblas, so we have to use the blas implementation from lapack-reference.
#
# That results in roughly the following decision tree:
#
# no_libgfortran = (uwp || (windows && arm))
# can_link_mixed_static_libgfortran = !windows || !static
#
# if (no_libgfortran) {
# return {
# "blas": "openblas",
# "lapack": "clapack"
# };
# } else if (can_link_mixed_static_libgfortran) {
# return {
# "blas": "openblas",
# "lapack": "lapack-reference[noblas]"
# };
# } else {
# return {
# "blas": "lapack-reference[blas]",
# "lapack": "lapack-reference[blas]"
# };
# }
#
# Scoping this to just the 'can use openblas' question, we get:
# uwp || (windows && arm) || !windows || !static
# and for lapack-reference[blas], the DeMorgan'd inverse of that:
# !uwp && !(windows && arm) && windows && static
if(VCPKG_TARGET_IS_OSX OR VCPKG_TARGET_IS_IOS)
# Use Apple's accelerate framework where available
set(BLA_VENDOR Apple)
set(requires "")
set(libs "-framework Accelerate")
set(cflags "-framework Accelerate")
else()
set(BLA_VENDOR OpenBLAS)
set(requires openblas)
endif()
configure_file("${CMAKE_CURRENT_LIST_DIR}/blas.pc.in" "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/blas.pc" @ONLY)
if(NOT VCPKG_BUILD_TYPE)
configure_file("${CMAKE_CURRENT_LIST_DIR}/blas.pc.in" "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/blas.pc" @ONLY)
endif()
if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
set(BLA_STATIC ON)
else()
set(BLA_STATIC OFF)
endif()
configure_file("${CMAKE_CURRENT_LIST_DIR}/vcpkg-cmake-wrapper.cmake.in" "${CURRENT_PACKAGES_DIR}/share/blas/vcpkg-cmake-wrapper.cmake" @ONLY)
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